The precipitation data from 30 stations over the Zhujiang River Delta duringthe period of 1965-1984 are used in this study. The statistical relationship between relative interpolation standard errors and correlation functions is concluded by computingthe correlation functions of the precipitation for June’s in this area. On the principle thatthe standard error of inter polation should not exceed the standard error of observation,the appropriate average distance between raingauge stations in this area is estimated tobe 36 kms. Finally, the rational distribution of raingauge networks in this area is laid down by calculating the optimum interpolation standard errors for all these stations.